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# Conservation of momentum - Physics

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### Conservation of momentum - Physics

1. 1. Applications in daily life
2. 2. Newton’s Cradle By pulling one ball away from the others and releasing it, the ball will swing and strike the second ball, which in turns sends the momentum through the series of balls causing the last ball to move away from the group. When the last ball swings back, its collision then causes the first ball to move away. This process repeats until it finally wears down. Pulling away several balls will result in the same number of balls moving away at the other end.
3. 3. A large mass of fuel is blasted out of the bottom of the rocket at a high velocity. To conserve momentum, the rocket must have equal momentum in the opposite direction, and so the rocket shoots up into the air. As more fuel is burnt, the mass of the rocket increases but the momentum remains more or less constant, so velocity increases.
4. 4. Jet engine The fuel used in either a jet or rocket engine has mass, as does the rocket/jet being propelled. When burned, the fuel generates hot exhaust gases (which have mass) being forced out the back end of the engine. Since the gases have low mass, but high velocity, they have momentum. In order to conserve momentum in the entire system, the jet/rocket (which has a high mass) starts moving in the opposite direction. In addition, the acceleration is enhanced by the fact that the rocket/jet is losing mass (the fuel being burned).
5. 5. Squids secrete a jet of water(ink) from their body. An equal and opposite momentum is created. The squid moves in the opposite direction.
6. 6. When two players hit each other, they will either bounce back or fall based on their momentum. The momentum is equal before and after collision.
7. 7. Thank You